* upstream/master: (638 commits)
Simplify background migrations stealing code
Expire cached user IDs that can see the performance after 5 minutes
Promote visibility level helpers from Group to Namespace
Fix off-by-one error in background migration retries
Recover from all exceptions when stealing bg migration
Fix label creation from new list for subgroup projects
move click handler to button. when on the icon it wasn't triggered in firefox
Fix incorrect AWS ELB metrics.
Fix wrong link to docs in docs styleguide
Update issue-related docs
Refactor groups docs
Add subgroups limitations to Pages docs
Update Google launcher details
Split docs on IP whitelist for monitoring access
Update health check docs
Bump fog-core to 1.44.3 and fog providers' plugins to latest
Introduce have_gitlab_http_status
Remove Repository#search_files
Update Pipeline's badge count in Merge Request and Commits view to match real-time content
Fixes the user order being overriden in the autocomplete controller
...
When the owner of a pipelines schedule was either blocked or was removed
from the project, the pipeline schedular would still schedule the
pipeline.
This would than fail however, given the user had no access to the
project and it contents. However, a better way to handle it would be to
not schedule it at all. Furthermore, from now on, such schedules will be
deactivated so the schedule worker can ignore it on the next runs.
